QRadioButton {
    spacing: 8px;
}
QRadioButton::indicator {
    width: 16px;
    height: 16px;
    border-radius: 8px;
    border: 2px solid #999999;
    background-color: white;
}
QRadioButton::indicator:checked {
    border-color: #0078d4;
    background-color: #0078d4;
    /* 内圆点效果 */
    background: radial-gradient(circle, white 0%, white 30%, #0078d4 35%, #0078d4 100%);
}